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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Additional Information) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 897 |
Weighted-average remaining requisite service period | 1 year 10 months 24 days |
Service Period | Equity Classified Award | Equity-Settled Award | Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 73,991 |
Weighted-average remaining requisite service period | 2 years 7 months 6 days |
Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 34,399 |
Weighted-average remaining requisite service period | 2 years 4 months 24 days |
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 1,137 |
Weighted-average remaining requisite service period | 2 years 10 months 24 days |
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 4,096 |
Weighted-average remaining requisite service period | 3 years |
Accrued compensation and benefits expenses | Service Period | Liability Classified Award | Cash-Settled Award | Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Liability associated with RSUs | $ 18,577 | $ 21,902
2020 Acquisitions | Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Remaining unrecognized stock-based compensation cost | $ 698 |
Weighted-average remaining requisite service period | 2 years 3 months 18 days |
Estimated future operating results, period | 2 years |
Awards vesting period | 3 years |
Award value | $ 11,527 |

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